Charging roller with blended ceramic layer

Details Charging roller with blended ceramic layer Charging roller with blended ceramic layer

1996-08-16

1998-01-13

Cuda, Irene

Roll or roller

Concentric layered annulus

Specific composition

492 49, B23P 1500

Patent

active

057073260

ABSTRACT:
A charging roller for use in a xerographic copying machine includes a cylindrical roller core, and a ceramic layer formed by plasma spraying a blend of an insulating ceramic material and a semiconductive ceramic material in a ratio which is selected to control an RC circuit time constant of the ceramic layer in response to an applied voltage differential. The ceramic layer is sealed with a solid, low viscosity sealer, such as Carnauba wax, to protect the ceramic layer from moisture penetration.

REFERENCES:
patent: 3521126 (1970-07-01), Granzow et al.
patent: 4743940 (1988-05-01), Nagasaka et al.
patent: 4793041 (1988-12-01), Jenkins et al.
patent: 4895629 (1990-01-01), Castegnier et al.
patent: 5322970 (1994-06-01), Behe et al.
patent: 5609553 (1997-03-01), Hyllberg

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